Trigonometric function is one of the most important contents in maths in senior middle school. New teaching material was abridged in the base of original teaching material.
三角函数是高中数学重要的内容之一，新教材在原教材基础上作了缩简。
Trigonometric function is one of the most important contents in maths in senior middle school. New teaching material was abridged in the base of original teaching material.
三角函数是高中数学重要的内容之一，新教材在原教材基础上作了缩简。
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